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-- Top : China : Qinghai : Wild Poliovirus in Qinghai Province - China, 1999
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Wild Poliovirus in Qinghai Province - China, 1999
Report by the United States Center for Disease Control on poliovirus cases in the province.
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm4906a1.htm
From: Qinghai
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Date: Sep 20, 2011
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